A speed limit posted on a curve: Do you currently have car insurance? Insurance is mandatory to drive in Ohio Yes I have insurance. But please show me your best quotes. No, please help me find the best insurance. Question A speed limit posted on a curve: Answers Is likely acceptable to be driven in a double or triple. Is the minimum speed that should be driven in a double or triple. Could be too fast to be driven in a double or triple. Should be increased when driving a double or triple. Explanation A posted speed on a curve may be safe to be driven when operating a straight truck or a single-trailer combination but unsafe to be driven in a double or triple. This questions appears in the following tests: South Dakota Double